/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.custom.websocket.server;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketServerCompressionHandler;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.handler.timeout.IdleStateHandler;
import io.netty.util.AttributeKey;

import java.util.concurrent.TimeUnit;

/**
 */
public class WebSocketServerInitializer extends ChannelInitializer<SocketChannel> {


    public static final String WEBSOCKET_PATH = "/websocket";

    private final SslContext sslCtx;

    public WebSocketServerInitializer(SslContext sslCtx) {
        this.sslCtx = sslCtx;
    }

    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        if (sslCtx != null) {
            pipeline.addLast(sslCtx.newHandler(ch.alloc()));
        }
        pipeline.addLast(new HttpServerCodec());
        pipeline.addLast(new HttpObjectAggregator(65536));
        pipeline.addLast(new WebSocketServerCompressionHandler());
        pipeline.addLast(new ChunkedWriteHandler());
        pipeline.addLast(new IdleStateHandler(7,7,10, TimeUnit.SECONDS));
        pipeline.addLast(new WebSocketServerProtocolHandler(WEBSOCKET_PATH,
                null,
                true,
                65536,
                true,
                false,
                false,
                10000L));
        pipeline.addLast(new WebSocketFrameHandler());
    }
}
    /**
     * 拆包 https://blog.csdn.net/mafei6827/article/details/79886593
     *         https://www.freesion.com/article/80111366384/
     * 心跳
     * https://www.cnblogs.com/xjwhaha/p/13554870.html
     * https://www.jianshu.com/p/b144ca9ad241
     * 总结：通过IdleStateHandler检测的是消息帧，如果是实现自定义消息类型的心跳包可以通过该方法检测实现，如果是检测控制帧中的ping，pong心跳包，则需要通过WebSocketServerProtocolHandler这个handler实现
     */
